/*
    变量交换练习
*/
#include <stdio.h>
int main() {
    int num = 3, num1 = 7, i = 0;
   /* i = num;
    num = num1;
    num1 = i;*/
    num = num + num1;
    num1 = num - num1;
    num = num - num1;
    printf("num是%d,num1是%d\n", num , num1);
    return 0;
}
